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We theoretically and numerically investigate the linear and nonlinearmagneto-optical contributions to the refractive index of metal nanospheres. Theanalysis is in good agreement with the experimental extinction spectra of goldnanocolloid solutions, with threshold magnetic fields less than 1 mT whenilluminated with light intensities less than 1 W/cm^2. Plasmonic current loopsand vortex power flows provide a new framework for the dynamical interactionbetween material magnetization, light polarization and nano-surfaces. Thephoto-induced magneto-optical interaction of non-magnetic metal nanocolloidsimparts significant, non-negligible torque forces in nanofluids.

Ultra-Low-Intensity Magneto-Optical and Mechanical Effects in Metal Nanocolloids